What is a hoisting machine?
Table of Contents
- 1 What is a hoisting machine?
- 2 Which drive is used for crane application?
- 3 Which motor is most suitable for crane drive operation?
- 4 How is hoisting equipment used?
- 5 Which type of drive can be used for textile industry?
- 6 What drive is also called as line shaft drive?
- 7 Which type of motor are used in crane?
- 8 What is hoist load?
What is a hoisting machine?
Hoisting machine means a device intended to raise and lower a suspended or supported unit.
Which drive is used for crane application?
Conventional AC operated crane drives use slip ring induction motor whose rotor windings are connected to power resistance in 4 to 5 steps by power contactors. Reversing is done by changing the phase sequence of the stator supply through line contactors. Braking is achieved by plugging.
What is the characteristics of the drive for crane hoisting and lowering?
Which of the following motors is preferred for boom hoist of a travelling crane?…
| Q. | The characteristics of drive for. crane hoisting and lowering is |
|---|---|
| B. | precise control |
| C. | fast speed control |
| D. | all of the above. |
| Answer» d. all of the above. |
Which motor is most suitable for crane drive operation?
Synchronous motor. For crane travel, trolley travel and boom hoist of traveling crane requires high starting torque and constant speed in operation. Hence slip ring induction motor is preferred.
How is hoisting equipment used?
Hoisting Equipment lifts loads with either link or roller chain or wire rope. It is powered one of three ways and is used with a number of attachments to facilitate load lift, including: Likewise, when equipped with a wire rope as the lifting medium, they are called air wire rope hoists.
Is hoisting equipment or machinery by mechanical means?
Hoist means a mechanical device for lifting and lowering loads by winding a line onto or off a drum. As used in this standard, “hoisting” can be done by means other than wire rope/hoist drum equipment. Include/including means “including, but not limited to.”
Which type of drive can be used for textile industry?
Squirrel cage Induction Motor drive can be used for Textile Industry. The textile mill has various processes like ginning, spinning, and looms. The ginning means the separation of seeds from cotton.
What drive is also called as line shaft drive?
d) Stepper drive. Explanation: Group drive is also called as Line shaft drive. In this type of drive, a single motor drives a line shaft.
Which type of drive can be used for mining process?
Which type of drive can be used for Minning Process? The motors used in coal and mining are classified into two groups. The first group is drives for mine accessories such as compressors, pumps, etc. While the second motors are used for actual mining process i.e. to drive the cutters, drillers etc.
Which type of motor are used in crane?
Answer: As the purpose of the crane is to lift heavy load through rope or chains, so it demands a kind of motor, which has a very high starting torque to lift the load at low current. Squirrel cage induction motor has the problem of low starting torque due to low resistance.
What is hoist load?
Hoists lift and lower by use of a chain, cable, or wire rope. The lifting means for suspending and moving the load up or down in a hoist are normally link chain (coil chain), roller chain (similar to bicycle chain), or wire rope, but other materials such as high strength fabric, can be used in specialized applications.
Where is hoist used?
The main purpose of a hoist is to lift or lower material or equipment. Examples of hoisting apparatus are: mobile cranes; tower cranes; electric overhead travelling cranes; vehicle hoists; winches; come-alongs (when used to lift); jacks; lever-operated hoists; hand chain hoists; and, manual pullers.